Halloween Spooktacular and Pet Adoptions: Families (including their dog) are invited to a trick or treat event at the Streets of Brentwood from 1 to 4 p.m. Oct. 26. See animals available for adoption, visit pet services booths and enjoy carnival games. Contests include best costume (dog only), best bark, best trick and best costume (family and dog). Nominal fees apply for the carnival and contests. Proceeds benefit Contra Costa Humane Society animals and programs. 925-279-2247, ext. 307, www.cchumane.org.

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Halloween Adopt-a-Thon: Cats and kittens will be available for adoption at reduced rates during a Halloween Adopt-a-Thon hosted by Sunshine Rescue Group. There will also be a baked goods sale to benefit their medical fund which helps homeless cats. 11 a.m.-5 p.m. Oct. 26, BayFair Petsmart, 15555 East 14th St., San Leandro. 510-483-4599, www.facebook.com/sunshinerescuegroups/events.

Halloween Costume Contest and Sidewalk Stroll: A Canine and Critter costume contest will take place at noon Oct. 26, at City Park, Military W. and First streets, in Benicia. Additional activities for kids of all ages will be held from 10 a.m. to 1 p.m. Free. 707-745-9791, www.beniciamainstreet.org.

Levee Top Tromp: Explore the back country of Big Break on a guided walk along the levee top discovering the many habitats found in this wetland. 10 a.m.-noon Oct. 27. Big Break, 69 Big Break Road, Oakley. Registration required. 888-327-2757, www.ebparksonline.org.

"A one of a Kind Diablo Wilderness Experience: Save Mount Diablo will host an original show featuring 3D images of the Diablo wilderness by photographer Stephen Joseph set to an original score performed by the Contra Costa Wind Symphony. 6-9 p.m. Nov. 6. Lesher Center for the Arts, 1601 Civic Drive, Walnut Creek. General admission is $55 and includes appetizers and refreshments. VIP tickets are $100 and include an after party at Scott's Seafood Restaurant. 925-947-3535, www.savemountdiablo.org.

Adopt A Rescued Rabbit: Contra Costa Rabbit Rescue and Contra Costa County Animal Services will have rescued rabbits available for adoption from 11 a.m. to 3 p.m. Nov. 9 at Petco, 1170 Arnold Drive, Martinez. Bring your spayed or neutered rabbit in for free nail trims, grooming and socializing. See currently available rabbits at www.ccasd.org; www.contracostarabbitrescue.org.

Loma Vista Farm: Field trips and tours are available for schools, day cares, garden clubs, senior centers and other groups, Monday through Friday throughout the spring and summer. 707-556-8765, www.lomavistafarm.org.

Animeals: The Valley Humane Society operates a pet food pantry that provides regular free meals for dogs and cats of seniors and low-income families. Donations of wet or dry dog and cat food are always accepted, even if opened or recently expired and can be dropped off during open hours at Valley Humane Society, 3670 Nevada St., Pleasanton. Pet-related items such as litter, treats, and toys are also needed. Pet food distribution takes places through partnerships with local food banks: Pleasanton: Valley Bible Church, first Thursdays monthly, 7106 Johnson Drive. Livermore: Tri-Valley Haven, third Wednesdays monthly, 3663 Pacific Ave. http://valleyhumane.org/programs/animeals.

South Bay

Rabbit Haven Adoption and Education Show: The Rabbit Haven will have rescued rabbits available for adoption from 11 a.m. to 4 p.m. Nov. 2, at For Other Living Things, 1261 South Mary Ave., Sunnyvale. Adoption fees include a vet check, coupons and an education packet. Nail trims and home health checks will be available to all rabbits for a donation. See available rabbits at www.therabbithaven.org. 831-600-7479.

Fishing in the City: Learn to fish clinics teach the basics of fishing to children and adolescents ages 5-15. Equipment and tackle are provided. There is no charge for the clinics but there may be a park entrance fee. Each adult may bring two children; a driver's license is required for a rod loan. For information, email erotman@dfg.ca.gov.

Dog Book Reading Club: Do you love dogs? Want to learn more about their behavior, training, learning, body language, and using positive training methods? The Humane Society Silicon Valley Dog Book Reading Club meets from 2-4 p.m. fourth Sundays monthly to discuss a different book. 901 Ames Ave., Milpitas. Free. 408-262-2133, www.hssv.org.

Peninsula

Adoptoberfest: Through Oct. 31, the Peninsula Humane Society and SPCA has set adoption fees for any cat, one year or older at $13. The price includes spay or neutering before adoption, vaccinations, health and behavior screening, ID, tag and microchip. Regular adoption fees are $50 and up. Interested adopters are encouraged to complete a one-page adoption profile before visiting. To download the profile and to see available cats, visit www.phs-spca.org. PHS/PSCA's Center for Compassion is located at 1450 Rollins Road, Burlingame. Open hours are 11 a.m. to 7 p.m. weekdays and 11 a.m. to 6 p.m. weekends. Adopters should arrive an hour before closing to complete an adoption.

CFA Allbreed Cat Show: More than 20 breeds of purebred cats, kittens, veterans and domestic pet cats will be competing for top awards throughout the day. Talk to the breeders, watch the judging and learn about the different cats. Rescue cats will be available for adoption. 9 a.m.-5 p.m. Nov. 2. Redwood Hall, San Mateo County Event Center, 1346 Saratoga Drive, San Mateo. $5-$25. 925-934-3461.

Rescue Groups Help Local Pets in Need: More than 20 adoption groups in the San Bruno area are hosting a mega adoption event from 10 a.m. to 3 p.m. Nov. 3, at Petco, 1150 El Camino Real, San Bruno. Dozens of dogs and cats available for adoption as well as rabbits, chinchillas, reptiles and other pets looking for a forever home. Hourly events include K-9 officer demonstrations, puppy playtime, seminars, costume contest, games and giveaways for new pet parents. www.petco.com/adoptions.

Wag Hotel Open House: Wag Hotels is celebrating the grand opening of its new Redwood City facility with an open house from 9 a.m. to 5 p.m. Nov. 9-10 and Nov. 16-17. Check out the kitty penthouses, suites and more during a personalized tour. 1025 Hansen Way, Redwood City. Free. 888-924-5463, http://waghotels.com.

SPCA Holiday Window: The unveiling of the 27th annual holiday windows featuring adoptable kittens and puppies from the San Francisco SPCA will take place at 5 p.m. Nov. 22 at Macy's Union Square, corner of Stockton and O'Farrell streets. The animals featured in the windows will be available for adoption inside the temporary SF SPCA Adoption Center on the first floor of Macy's. www.sfspca.org.

Aquarium Offers Free Admission to Veterans: The Monterey Bay Aquarium will celebrate the bravery and sacrifice of U.S. military personnel during Veterans Day weekend by offering veterans, active-duty military, reservists and retirees free admission Nov. 9-11. A valid military ID must be presented at the main entrance. 886 Cannery Row, Monterey. www.montereybayaquarium.org.

Gray Lodge Wildlife Area Guided Wetlands Tours: A wildlife naturalist will lead a group (minimum of 18 people) through the diverse wetlands of the Gray Lodge Wildlife Area. Learn wildlife identification and behavior patterns, conservations efforts and more. The experience can be customized to include requested information, along a half-mile walking route. For information and scheduling, call 530-846-7505 or email ldieter@dfg.ca.gov. www.dfg.ca.gov/lands/wa/region2/graylodge/index.html.

Elkhorn Slough Ecological Reserve docent-led walks: 10 a.m.-1 p.m. Saturdays and Sundays. Binoculars and bird books available to borrow at no cost. Visitor Center and main overlook are fully accessible. Day use is $4.32 per person, ages 16 and older. Groups of 10 or more should schedule a separate tour. www.dfg.ca.gov/lands/er/region4/elkhorn.html.